In the past, the spoilsports who wanted to take the fun out of Halloween complained about the pagan origins of the holiday or feared too much focus on the scary and macabre wasn’t good for young children.

Now we may have to recognize a third category of spoilsport: the anti-obesity crusader.

A woman in North Dakota claims she will give trick-or-treaters she believes are “moderately obese” a letter to their parents, advising that their kids “should not be consuming sugar and treats to the extent of some children this Halloween season.” Her hope, she adds, is that the parents will “not allow your child to continue these unhealthy eating habits.”

If she’s serious — and there’s always the chance this is some unfunny hoax — the indifference to the feelings of children singled out as fat is mind-boggling. For that matter, consider the staggering arrogance and smugness of someone who appoints herself enforcer of juvenile weight and is willing to humiliate kids in pursuit of her goal.